Missing In Action - Han Jisung ff

Do Byungjoo changed after her friend death. She's not how she used to be. Sunshine and everybody admire her for her social butterfly attitude. Han Jisung who always watching her from afar, suddenly curious about the girl changed. but what will happens when Jisung talked to her and help her just to prove her thought about everyone is wrong. does she will stop pushing other people and learned to open her heart? or does she will continue what she always do to other people?